Color filter, manufacturing method thereof, electrooptical device and electronic equipment

Abstract

A method for manufacturing a color filter having a picture element part surrounded by a partition wall and provided in the plural number on a substrate including a step of forming the partition wall that has a lyophobic quality on the substrate, step of forming a lyophilic layer in the picture element part by applying a lyophilic liquid that develops the lyophobic quality to a substantially whole surface of the substrate on which the partition wall is formed all at once and a step of applying a droplet of colorant to the picture element part in which the lyophilic layer is formed.

Description

BACKGROUND OF THE INVENTION [0001] 1. Technical Field [0002] The present invention relates to a color filter, a manufacturing method thereof, an electro-optical device and electronic equipment. [0003] 2. Related Art [0004] When a color filter is manufactured by a droplet discharging method (an ink-jet method), droplets of a pigment (ink) are sequentially applied to each picture element which is surrounded by a partition wall called “bank”. In this case, if the droplet is not spread evenly within the picture element, unevenness or color mixture surmounting the partition wall could occur. For this reason, the partition wall is required to have a lyophobic quality and the picture element is required to have a high lyophilic quality. [0005] In order to give the lyophobic quality to the partition wall, a lyophobic photoresist has been used to form the partition wall. Japanese Unexamined Patent Publication No. 2002-372921 is a first example of related art. As described in the first exampl...

AI Technical Summary

Benefits of technology

[0008] An advantage of the invention is to provide a color filter in which the high wettability can be obtained in the picture element, a manufacturing method thereof, an electrooptical device and electronic equipment.

[0009] According to a first aspect of the invention, a method for manufacturing a color filter having a picture element part surrounded by a partition wall and provided in the plural number on a substrate including a step of forming the partition wall that has a lyophobic quality on the substrate, step of forming a lyophilic layer in the picture element part by applying a lyophilic liquid that develops the lyophobic quality to a substantially whole surface of the substrate on which the partition wall is formed all at once and a step of applying a droplet of colorant to the picture element part in which the lyophilic layer is formed.

[0010] According to the first aspect of the invention, the droplet of the colorant applied to the substrate spreads out along the lyophilic layer even if the picture element part is not treated with a process to give the lyophilic quality such as a plasma treatment. Therefore, it is possible to obtain a flat and uniform colored layer in the picture element part.

[0011] In this case, the lyophilic liquid may be applied to the substrate all at once by a spin coat method.

[0012] In this way, it is possible to apply the lyophilic liquid to the picture element parts more easily and swiftly with simple equipment. The lyophilic liquid applied to the partition wall will be introduced into the picture element part since the partition wall has the lyophobic quality.

[0013] Furthermore, in this case, the lyophilic liquid may include a particle made of at least one substance selected from the group consisting of titanium oxide (TiO2), zinc oxide (ZnO), tin oxide (SnO2), strontium titanate (SrTiO3), tungsten oxide (WO3), bismuth oxide (Bi2O3) and iron oxide (Fe2O3). As the lyophilic liquid, a dispersion liquid of silica (SiO2) may also be used.

Problems solved by technology

In this case, if the droplet is not spread evenly within the picture element, unevenness or color mixture surmounting the partition wall could occur.

However, the following problem exists in the above-mentioned technique.

Therefore, it was difficult to obtain a high wettability on the whole picture element, especially, in an area where is close to the partition wall within the picture element.

As a result, a flat colored layer with an even thickness could not be obtained and it could lead to image quality deterioration.

Thereby, it is also difficult to obtain enough wettability and spreadability.

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